I want to have a part of my app start the camera and overlay a shape (or a .png with the shape being transparent). Basically i want the app to envoke the camera (i want it to work accross different resolutions) but instead of having it just have the 5mp square image or w/e, have it show only a star, or a cirlce, or some arbitrary shape. The app will then take the photo and process the image to make the image JUST the shape i want, but I do not know how to make the camera viewfinder have a overlay so that you can position the subject of the photo in the star so that when the processing is done it will have w/e you wanted in the pic.

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